Process of elimination required here. How much memory have you got,and is by way of one or more than one stick of memory? Have you run any virus checkers on the pc lately, inbound virus activity that has penetrated the registry often cause unplanned shutdowns. In addition to this, there may be an instability with your motherboard, power reduction,cpu overheat ( check your cpu cooling fan works properly and is not choked with dust) come back to me for more guidance at compdoctor2005@btinternet.com
Chris
chris, March 2009